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- W2038328049 abstract "Abstract Chemical studies of various igneous rocks intrusive into many different rocks have been examined to see if elemental transfer has taken place. Systems examined include: granite intrusive into shale and siltstone; basalt intrusive into granodiorite, diorite, rhyolite and dolomite; diabase intrusive into rhyolite and extrusive over arkose; rhyolite extrusive over basalt; lamprophyre intrusive into evaporites; monzonite intrusive into tuff and andesite; and quartz monzonite intrusive into metasedimentary rocks. The mechanism for elemental transport in these systems is due in part to diffusion and in part to chemical reaction between intrusive and host rocks. Evidence for transport of elements from intrusive into intruded rocks is noted for several elements. In some cases, the distribution of some elements is mineralogically controlled, and variations in Co, Cr, REE's, Ni, Cu, Zr, Mn, Ti, Rb, Sr, U and Th can be attributed to more-or-less specific reactions. In a few contact zones, there has been limited migration of Cs, but usually only within 0.5-1.0 m of the igneous rock contact. Thermal effects of the igneous intrusions are to reset some mineral isotopic systematics (loss of 40Ar, redistribution of ★87Sr, 18O), but otherwise the whole-rock chemistry usually remains unchanged. Collectively, the data for elemental behavior in the vicinity of the igneous contacts studied show that elemental migration of redistribution is often restricted to within 0.5-1.0 m of the contact, thus suggesting that for hypothetically stored radioactive waste canisters, emplaced at much lower temperatures, little if any elemental transport would take place in the event of breaching of the waste package." @default.
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- W2038328049 date "1986-06-01" @default.
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- W2038328049 title "Natural analogues for radwaste disposal: Elemental migration in igneous contact zones" @default.
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- W2038328049 doi "https://doi.org/10.1016/0009-2541(86)90034-3" @default.
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